Hi. I have three male guinea pigs, brothers who have always lived together. I'm not sure of their age as they were rescues but I think they're about two. They've always squabbled and one of them has tended to get picked on a bit but it's never been anything serious. But a week or so ago, for no reason I can see (I had been at home all day and everything was fine), they started to attack each other, proper fighting. I separated them and have tried numerous ways since to try to reunite them but the one who was getting picked on before is still being picked on but this has escalated to such an extent that he seems completely stressed out when they're together. They have a very large C&C pen which I've now put a mesh divider in but I'm thinking about the longer term. I guess my questions are: are there any tips anyone has to try to reunite them or could it be a lost cause? If they can't live together, I was thinking of getting a friend for the one who's on his own (the other two get along just fine) and getting another pen - is this a good idea? Or is a divider in the pen a better way to go, so at least he's still got his brothers for company? Any experience or suggestions that anyone is willing to share would be much appreciated! Thanks.